Biomechanical characteristics of bone cement reduction for V-type calcaneal fractures

doi:10.12307/2021.318

Abstract

Abstract: BACKGROUND: Bone cement has good strength and fixation, which can effectively play the role of fracture reduction.
OBJECTIVE: For V-type calcaneal fractures, the reduction was treated by implanting different volumes of polymethyl methacrylate bone cement, and the effect of different volumes of bone cement reduction on calcaneal fractures was analyzed by finite element method.
METHODS: A CT image of the foot and ankle of a normal male youth was selected to establish a three-dimensional finite element model of the calcaneal bone with physiological status. By simulating the clinical V-type calcaneal fractures, the model was cut to form a V-type calcaneal fractures. To simulate the clinical surgical reduction method for the fracture model, 2, 3 and 4 mL bone cement of different volumes were injected, respectively, to complete the establishment of the postoperative finite element model for the three groups. By applying the same load and constraint to the three groups of models, the maximum stress distribution and maximum deformation of the three groups of models under various load conditions were observed through finite element analysis and calculation.
RESULTS AND CONCLUSION: Under the action of vertical load of 700 N, the deformation and stress distribution of the overall model (including cancellous bone, cortical bone and bone cement) increased with the increase of the volume of bone cement. Among them, the volume of 4 mL bone cement showed the largest stress on the cancellous bone, cortical bone and bone cement, with peak stresses reaching 8.04, 136.96 and 10.15 MPa respectively. It is concluded that with the injection of bone cement, the stiffness of cancellous bone, cortical bone and bone cement all increased. As the volume of bone cement increases, the stress increase of cortical bone decreases and the increase of cancellous bone increases.

Key words: bone, calcaneus, V-shaped fracture, finite element analysis, bone cement, reduction

CLC Number:

Zhang Wen, Chen Liang, Jiang Zhenhuan. Biomechanical characteristics of bone cement reduction for V-type calcaneal fractures[J]. Chinese Journal of Tissue Engineering Research, 2021, 25(33): 5307-5311.

Figures/Tables 4

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